| 摘要 |
PROBLEM TO BE SOLVED: To manufacture a hardly graphitized carbon material by completing an infusibilizing treatment efficiently in a manufacturing method of the hardly graphitized carbon material which is a negative electrode material for lithium ion secondary battery.SOLUTION: There is provided a manufacturing method of a hardly graphitized carbon material having a crosslinking treatment process for applying a crosslinking treatment to a raw material of the hardly graphitized carbon material to obtain a crosslinking treatment article, an infusibilizing treatment process for applying an infusibilizing treatment on a carbon material to obtain an infusibilizing treatment article, a process for burning the infusibilizing treatment article to obtain the hardly graphitized carbon material, where the carbon material is the crosslinking treatment article satisfying all of conditions of (a) or (c) or a crosslinking treatment article having adjusted particle size distribution of the crosslinking treatment article obtained in the crosslinking treatment process satisfying all of (a) or (c) in the infusibilizing treatment process. In particle size distribution measured by a laser diffraction method by using water as a dispersant, (a) frequency of particles having particle diameter of 8 to 16 μm of 50 to 75%, (b) frequency of particles having particle diameter of 1 to 2 μm (B) of 15 to 20%, (c) a relationship of frequency of particles having particle diameter of 1 to 2 μm (B)/frequency of particles having particle diameter of 8 to 16 μm (A)=0.25 to 0.35 is satisfied.SELECTED DRAWING: None |
